For if we believe that Jesus died and rose again, even so God will bring with him those who have fallen asleep in Jesus.
Verse 14. For if we believe that Jesus died and rose again. That is, if we believe this, we ought also to believe that those who have died in the faith of Jesus will be raised from the dead. The meaning is not that the fact of the resurrection depends on our believing that Jesus rose, but that the death and resurrection of the Saviour...
For if--confirmation of his statement, Th1 4:13, that the removal of ignorance as to the sleeping believers would remove undue grief respecting them. See Th1 4:13, "hope." Hence it appears our hope rests on our faith ("if we believe"). "As surely as we all believe that Christ died and rose again (the very doctrine specified as taught at Thessalonica, Act 17:3), so also will God...
For if we believe that Jesus died, and rose again,.... As every Christian does, for both the death and resurrection of Christ are fundamental articles of faith; nothing is more certain or more comfortable, and more firmly to be believed, than that Christ died for the sins of his people, and rose again for their justification; on these depend the present peace, joy, and comfort...